mediawiki-skins-Citizen/includes/CitizenHooks.php

<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

namespace Citizen;

use ConfigException;
use Exception;
use MediaWiki\MediaWikiServices;
use OutputPage;
use RequestContext;
use Skin;
use ThumbnailImage;

/**
 * Hook handlers for Citizen skin.
 *
 * Hook handler method names should be in the form of:
 *    on<HookName>()
 */
class CitizenHooks {
	/**
	 * @param OutputPage $out
	 * @param Skin $skin
	 * @return bool
	 */
	public static function onBeforePageDisplay( $out, $skin ) {
		$out->addModules( 'skins.citizen.bpd' );

		return true;
	}

	/**
	 * ResourceLoaderGetConfigVars hook handler for setting a config variable
	 * @see https://www.mediawiki.org/wiki/Manual:Hooks/ResourceLoaderGetConfigVars
	 *
	 * @param array &$vars Array of variables to be added into the output of the startup module.
	 * @return bool
	 */
	public static function onResourceLoaderGetConfigVars( &$vars ) {
		try {
			$config = MediaWikiServices::getInstance()->getConfigFactory()->makeConfig( 'Citizen' );
		} catch ( Exception $e ) {
			return false;
		}

		try {
			$vars['wgCitizenMaxSearchResults'] = $config->get( 'CitizenMaxSearchResults' );
		} catch ( ConfigException $e ) {
			// Should not happen
			$vars['wgCitizenMaxSearchResults'] = 6;
		}

		try {
			$vars['wgCitizenSearchExchars'] = $config->get( 'CitizenSearchExchars' );
		} catch ( ConfigException $e ) {
			// Should not happen
			$vars['wgCitizenSearchExchars'] = 60;
		}

		return true;
	}

	/**
	 * Lazyload images
	 * Modified from the Lazyload extension
	 * Looks for thumbnail and swap src to data-src
	 *
	 * @param ThumbnailImage $thumb
	 * @param array &$attribs
	 * @param array &$linkAttribs
	 * @return bool
	 */
	public static function onThumbnailBeforeProduceHTML( $thumb, &$attribs, &$linkAttribs ) {
		$file = $thumb->getFile();

		if ( $file !== null ) {
			$request = RequestContext::getMain()->getRequest();

			if ( defined( 'MW_API' ) && $request->getVal( 'action' ) === 'parse' ) {
				return true;
			}

			// Set lazy class for the img
			if ( isset( $attribs['class'] ) ) {
				$attribs['class'] .= ' lazy';
			} else {
				$attribs['class'] = 'lazy';
			}

			// Native API
			$attribs['loading'] = 'lazy';

			$attribs['data-src'] = $attribs['src'];
			$attribs['data-width'] = $attribs['width'];
			$attribs['data-height'] = $attribs['height'];

			// Replace src with small size image
			$attribs['src'] = preg_replace( '#/\d+px-#', '/10px-', $attribs['src'] );

			// So that the 10px thumbnail is enlarged to the right size
			$attribs['width'] = $attribs['data-width'];
			$attribs['height'] = $attribs['data-height'];

			// Clean up
			unset( $attribs['data-width'], $attribs['data-height'] );

			if ( isset( $attribs['srcset'] ) ) {
				$attribs['data-srcset'] = $attribs['srcset'];
				unset( $attribs['srcset'] );
			}
		}

		return true;
	}
}